Malaseb is registered to treat Seborrheic Dermatitis and Dermatophytosis. Seborrheic Dermatitis is the scientific name for a skin infection involving bacteria (Staphylococcus) and yeast (Malassezia). Dermatophytosis is the scientific name for ringworm, a condition which is not due to worms (like the name suggests) but is in fact a fungal infection.